Battery cooling system

Abstract

A cordless power tool has a housing which includes a mechanism to couple with a removable battery pack. The battery pack includes one or more battery cells as well as a vent system in the battery pack housing which enables fluid to move through the housing. A mechanism is associated with the battery pack to dissipate heat from the battery pack.

1. A cordless power tool comprising:
 a cordless power tool with a removable battery pack having a housing including a mechanism for coupling with the removable battery pack; 
 said removable battery pack comprising a housing with one or more cells in said housing, an inlet in said battery pack housing for enabling fluid to enter into said housing when said cordless power tools is in use, an outlet in said battery pack housing enabling fluid to exit said housing; and 
 a mechanism associated with said battery pack for dissipating heat from said battery pack and maintaining a desired temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     2. The cordless tool according to  claim 1 , wherein said mechanism includes at least one channel for moving fluid to said one or more cells and through said housing. 
   
   
     3. The cordless tool according to  claim 1 , wherein said mechanism includes a heat sink for dissipating heat from said one or more cells. 
   
   
     4. The cordless tool according to  claim 1 , wherein said mechanism includes a fan for forcing fluid through said vent system to dissipate heat from the battery pack housing. 
   
   
     5. The cordless tool according to  claim 1 , wherein said mechanism includes at least one fluid director for moving fluid to said one or more cells. 
   
   
     6. The cordless tool according to  claim 1 , further including a heat pump for providing cooling and heating of said one or more cells in said battery pack housing. 
   
   
     7. The cordless tool according to  claim 1 , wherein said mechanism includes a sensor for sensing temperature of said one or more cells and a heat dissipator for equalizing the temperature of said plurality of cells. 
   
   
     8. The cordless tool according to  claim 7 , said heat dissipator wicks heat from hotter cells to ambient or to other cells to equalize cell temperature. 
   
   
     9. The cordless tool according to  claim 1 , wherein said mechanism includes fluid directors for moving fluid around higher temperature cells of said one or more cells and a heat sink for dissipating heat from higher temperature cells of said one or more cells. 
   
   
     10. The cordless tool according to  claim 1 , wherein said mechanism includes fluid directors for moving fluid around higher temperature cells of said plurality of cells and a fan for forcing fluid said vent system to dissipate heat from the battery pack housing. 
   
   
     11. The cordless tool according to  claim 1 , wherein said mechanism includes a heat sink for dissipating heat from higher temperature cells of said one or more cells and a fan for forcing fluid through said vent system to dissipate heat from the battery pack housing. 
   
   
     12. A removable battery pack for a hand held cordless tool having a mechanism for coupling and decoupling the removable battery pack comprising:
 a housing with one or more cells in said housing, an inlet and outlet in said housing for enabling fluid to enter and exit said housing and an element on said housing for coupling and decoupling said battery pack with the coupling and decoupling mechanism of the hand held tool; and 
 a mechanism associated with said battery pack for dissipating heat in said battery pack housing and maintaining a desired d temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     13. The removable battery pack according to  claim 12 , wherein said mechanism includes at least one fluid director for moving fluid to said one or more cells. 
   
   
     14. The removable battery pack according to  claim 12 , wherein said mechanism includes at least one channel for moving fluid through said housing. 
   
   
     15. The removable battery pack according to  claim 12 , wherein said mechanism includes a heat sink for dissipating heat from said one or more cells. 
   
   
     16. The removable battery pack according to  claim 12 , further including a heat pump for providing cooling and heating of said one or more cells in said battery pack housing. 
   
   
     17. The removable battery pack according to  claim 12 , wherein said mechanism includes a sensor for sensing temperature of said one or more cells and a heat dissipator for equalizing the of said plurality of cells. 
   
   
     18. A removable battery pack for a hand held cordless tool having a mechanism for coupling and decoupling with the removable battery pack comprising:
 a housing with one or more cells in said housing, an inlet and an outlet in said housing for enabling fluid to enter and exit said housing and a member on said housing for mating said battery pack with the coupling and decoupling mechanism of the hand held tool; and 
 a mechanism associated with said battery pack for dissipating heat in said battery pack housing and maintaining a desired temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     19. A removable battery pack for a hand held cordless tool having a mechanism for coupling and decoupling with the removable battery comprising:
 a housing with one or more cells in said housing, an inlet and an outlet in said housing for enabling fluid to enter and exit said housing and said housing mating with the coupling and decoupling mechanism of the hand held tool; and 
 a mechanism associated with said battery pack for dissipating heat in said battery pack housing and maintaining a desired temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     20. A cordless power tool comprising:
 a cordless power tool with a removable battery pack having a housing including a mechanism for coupling with said removable battery pack; 
 said removable battery pack comprising a housing with one or more cells in said housing, a mechanism for sinking heat associated with said one or more cells in said housing; and 
 said mechanism for sinking heat dissipating heat from said cells in said battery pack and maintaining a desired temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     21. The cordless tool according to  claim 20 , wherein said mechanism includes a heat sink in contact with said one or more cells for dissipating heat from said one or more cells. 
   
   
     22. The cordless tool according to  claim 20 , said heat sink wicks heat from hotter cells to ambient. 
   
   
     23. A removable battery pack for a hand held cordless tool comprising:
 a mechanism for coupling and decoupling the removable battery pack with the handheld cordless tool; 
 a housing with one or more cells in said housing, a mechanism for sinking heat associated with said one or more cells in said housing; and 
 said mechanism for sinking heat dissipating heat in said battery pack housing and maintaining a desired temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     24. The removable battery pack according to  claim 23 , wherein said mechanism includes a heat sink in contact with said one or more cells for dissipating heat from said one or more cells. 
   
   
     25. A removable battery pack for a hand held cordless tool comprising:
 a mechanism for coupling and the removable battery pack with the hand held cordless tool; 
 a housing with one or more cells in said housing, a mechanism for sinking heat associated with said one or more cells in said housing; and 
 said mechanism for sinking heat for dissipating heat in said battery pack housing and maintaining a desired temperature for optimizing performance during use of the cordless power tool. 
 
   
   
     26. A removable battery pack for a hand held cordless tool comprising:
 a mechanism for coupling and decoupling with the removable battery with the hand held cordless tool; 
 a housing with one or more cells in said housing, a mechanism for sinking heat associated with said one or more cells in said housing; and 
 said mechanism for sinking heat for dissipating heat in said battery pack housing and maintaining a desired for optimizing performance during use of the cordless power tool.